(MFC) SSH to Cisco Switch - Processing "More" Responses

Demonstrates connecting to a Cisco switch, running a command to enable privileged mode, then running a command to get a paged response requiring the SPACE char to be sent to process "--More--".

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSsh.h>
#include <CkStringArray.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSsh ssh;

    bool success = ssh.Connect("SSH_SERVER_DOMAIN_OR_IP_ADDRESS",22);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Authenticate using login/password:
    success = ssh.AuthenticatePw("myLogin","myPassword");
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Start a shell session.
    int channelNum = ssh.QuickShell();
    if (channelNum < 0) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // If the CISCO switch returns a prompt with ">", then read until we get the prompt.
    // (It's not actually required that we do this, but it helps to know that all is OK at this point..)
    success = ssh.ChannelReceiveUntilMatch(channelNum,">","utf-8",true);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show what we received so far:
    strOut.append(ssh.getReceivedText(channelNum,"utf-8"));
    strOut.append("\r\n");

    // Send the "ena" command to enable privileged mode.
    // (For the Cisco switch, terminate command with a single CR char.)
    success = ssh.ChannelSendString(channelNum,"ena\r","utf-8");
    // Assume success for this example to make it shorter..

    // Read to the "Password:" prompt.
    success = ssh.ChannelReceiveUntilMatch(channelNum,"Password:","utf-8",true);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show what we received...
    strOut.append(ssh.getReceivedText(channelNum,"utf-8"));
    strOut.append("\r\n");

    // Send the password.
    success = ssh.ChannelSendString(channelNum,"MY_PASSWORD_FOR_ELEVATED_PRIVILEGE\r","utf-8");

    // The prompt now changes from "Something>" to "Something#>
    // Read until the new prompt..
    success = ssh.ChannelReceiveUntilMatch(channelNum,"#","utf-8",true);
    if (success != true) {
        strOut.append(ssh.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show what we received...
    strOut.append(ssh.getReceivedText(channelNum,"utf-8"));
    strOut.append("\r\n");

    // Send the "show running-config" command.
    // The response will be in multiple pages, each ending with "--More--" and requiring a SPACE bar to be sent
    // to get the next page.
    success = ssh.ChannelSendString(channelNum,"show running-config\r","utf-8");

    // Consume the response until we end with another prompt.
    CkStringArray saMatch;
    // Change "YOUR_PROMPT" to your actual prompt.  We don't want to check for only "#" because
    // it's not specific enough.  The data in the response could contain the "#" char...
    saMatch.Append("YOUR_PROMPT#");
    saMatch.Append("--More--");

    CkStringBuilder sbReceived;
    bool moreComing = true;
    while ((moreComing == true)) {

        success = ssh.ChannelReceiveUntilMatchN(channelNum,saMatch,"utf-8",true);
        if (success != true) {
            strOut.append(ssh.lastErrorText());
            strOut.append("\r\n");
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;
        }

        moreComing = false;

        sbReceived.Clear();
        sbReceived.Append(ssh.getReceivedText(channelNum,"utf-8"));

        strOut.append(sbReceived.getAsString());
        strOut.append("\r\n");

        if (sbReceived.Contains("--More--",true) == true) {
            moreComing = true;

            // Send a SPACE char just as if we were interactively pressing the SPACE key to get more output.
            success = ssh.ChannelSendString(channelNum," ","utf-8");
        }

    }

    ssh.Disconnect();


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }